<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">

          <!-- 渲染需要的行 -->
          <!-- 
            <div class="tr">
            <div class="td"><input type="checkbox" checked /></div>
            <div class="td"><img src="http://autumnfish.cn/static/火龙果.png" alt="" /></div>
            <div class="td">6</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease"> - </button>
                <span class="my-input__inner">2</span>
                <button class="increase"> + </button>
              </div>
            </div>
            <div class="td">12</div>
            <div class="td"><button class="del">删除</button></div>
          </div> 
        -->

        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">24</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( 6 )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty">🛒空空如也</div>
  </div>
  <script>
    const dataArr = [
      {
        id: 1,
        icon: 'http://autumnfish.cn/static/火龙果.png',
        isChecked: true,
        num: 2,
        price: 6,
      },
      {
        id: 2,
        icon: 'http://autumnfish.cn/static/荔枝.png',
        isChecked: false,
        num: 7,
        price: 20,
      },
      {
        id: 3,
        icon: 'http://autumnfish.cn/static/榴莲.png',
        isChecked: false,
        num: 3,
        price: 40,
      },
      {
        id: 4,
        icon: 'http://autumnfish.cn/static/鸭梨.png',
        isChecked: true,
        num: 10,
        price: 3,
      },
      {
        id: 5,
        icon: 'http://autumnfish.cn/static/樱桃.png',
        isChecked: false,
        num: 20,
        price: 34,
      },
    ]

    let tbody = document.querySelector('.tbody')
    // #region 全选反选功能




    function render() {
      let arr = dataArr.map((item, index) => {
        return `<div class="tr">
            <div class="td"><input data-id='${index}' type="checkbox" ${item.isChecked ? 'checked' : ''} /></div>
            <div class="td"><img src="${item.icon}" alt="" /></div>
            <div class="td">${item.price}</div>
            <div class="td">
              <div class="my-input-number">
                <button data-id='${index}' class="decrease"> - </button>
                <span class="my-input__inner">${item.num}</span>
                <button data-id='${index}' class="increase"> + </button>
              </div>
            </div>
            <div class="td">${item.price * item.num}</div>
            <div class="td"><button data-id='${index}' class="del">删除</button></div>
          </div> `
      })
      tbody.innerHTML = arr.join('')



      // #endregion

      // 总价模块：只选择勾选的商品
      const newArr = dataArr.filter(ele => ele.isChecked)
      // 总价
      const zongjia = newArr.reduce((prev, item) => {
        return prev += (item.num * item.price)
      }, 0)

      document.querySelector('.price-box .price').innerHTML = zongjia.toFixed(2)
      // 结算
      const jiesuan = newArr.reduce((prev, item) => {
        return prev += item.num
      }, 0)
      document.querySelector('.pay').innerHTML = `结算：${jiesuan}`

      const empty = document.querySelector('.empty')
      empty.style.display = dataArr.length === 0 ? 'block' : 'none'

    }
    render()





    // 购买个数的加和减
    // 减
    let decrease = document.querySelectorAll('.decrease')
    // 加
    let increase = document.querySelectorAll('.increase')
    // 加减值
    let spans = document.querySelectorAll('.my-input__inner')
    // 
    let checkAll = document.querySelectorAll('.tbody input[type=checkbox]')
    let qx = document.querySelector('.check-all input[type=checkbox]')




    tbody.addEventListener('click', (e) => {
      // input
      if (e.target.tagName === 'INPUT') {

        checkAll.forEach(item => {
          item.addEventListener('change', () => {
            qx.checked = Array.from(checkAll).every((item) => item.checked === true)
          })
          dataArr[e.target.dataset.id].isChecked = e.target.checked
          render()
        })
      }
      // 删除按钮
      if (e.target.className === 'del') {
        dataArr.splice(e.target.dataset.id, 1)
        console.log(dataArr);
        render()
      }
      // 加减
      if (e.target.className === 'decrease') {
        if (spans[e.target.dataset.id].innerHTML <= 1) {
          return
        }
        // console.log(spans[e.target.dataset.id]);
        // spans[e.target.dataset.id].innerHTML--
        dataArr[e.target.dataset.id].num--
        render()
      }
      if (e.target.className === 'increase') {
        // spans[e.target.dataset.id].innerHTML++
        dataArr[e.target.dataset.id].num++
        render()
      }
    })

    qx.addEventListener('change', () => {
      dataArr.forEach(item => {
        item.isChecked = qx.checked
      })
      render()
    })



  </script>
</body>

</html>